Press mold and means for cooling the mold



g- 1939- F. 1.. o. WADSWORTH PRESS MOLD AND MEANS FOR COOLING THE MOLDOriginal Filed March 4, 1955 @ATTORNEYS.

Patented Aug. 1, 1939 UNITED STATES PATENT OFFICE PRESS MOLD AND ME MANS FOR COOLING THE OLD istratrix,

Pittsburgh,

Pa., assignor to Ball Brothers Company, Muncie, Ind., a corporation ofIndiana Original application March 4, 1935, Serial No.

Divided and this application June 1,

1937, Serial No. 145,668

4 Claims.

This invention relates to glassware forming machines of the press andblow type and more particularly to improvements in the press molds forsuch a machine, and is a division of a pending application Serial No.9,133, filed March 4, 1935, by Frank L. O. Wadsworth, deceased.

The primary object of this invention is to provide press or parisonmolds for a forming machine which will have materially increased heatconduction, an accelerated heat radiation and latent heat absorbingmeans whereby the mold is maintained at the desired temperature at alltimes and the speed of the forming machine may be materially increased.

The speed of operation of glass forming machines is limited by thepermissible rise in temperature of the press or forming molds and inorder to attain the highest possible speed of operation means have beenprovided for rapidly carrying away the heat transmitted to these unitsfrom the molten glass by or through the combined agencies of amaterially increased conduction, accelerated radiation and latent heatabsorption (vaporization), all of which effectively cooperate inattaining the desired cooling action. To obtain increased conduction themolds themselves and the table supports therefor are made unusuallyheavy and massive and this is made possible, in the practice of theinvention, by moving the supporting tables for the molds continuouslyand, consequently, avoid the kinetic inertial effects which presenttroublesome problems in the operation of a start and stop machine andwhich can only be minimized by keeping the moving parts as light aspossible.

Accelerated radiation and the consequent dissipation of the heat by suchradiation are secured in two ways: first, by providing the externalsurfaces of the mold sections with closely spaced Vertical ribs or finswhich are preferably formed by cutting away the outer hard shell of themold casting and, second, by then subjecting this surface to anoxidizing or sulphidizing treatment to produce a dull, dead black finishhaving a very high coefficient of radiation.

Provision is also made for successivelysubjecting the interior andexterior surfaces of the opened and closed press mold sections tocontinuous blasts of cooling fluid which are all directed upwardly inorder to supplement and not oppose the efiects of natural convectioncurrents.

One exemplification of the present mold and table construction isillustrated in the acompanying drawing, wherein Figure 1 is a top planview of a press mold table equipped with molds made in accordance withthe invention and provided with my improved cooling means;

Fig. 2 is a. section taken on line IIII of Fig. 1;

Fig. 3 is an enlarged detail section on the line of the press mold tableiii, and each of the mold sections is opened and closed in the usualmanner. The mold table Ill is mounted for rotation around a centralcolumn which also carries a press plunger mechanism !6 for forming orpressing the charges delivered to the molds I |a--l lb into parisons.

In order to increase dissipation of heat by radiation, the body sectionsi la of the molds are provided, on their outer surfaces, with verticallyextended ribs or fins I! which are preferably formed by cutting away theouter shell of the mold casting. To further increase the radiation ofthe body sections Ha, the finned castings are subjected to an oxidizingor desulphidizing treatment to produce a dull, dead black finish whichhas a high coeflicient of radiation.

To obtain a forced convection cooling of both the inner and the outersurfaces of the body sections I la of the press molds, the. lowerplatform [4 of the table Ill is provided with a plurality of radiallydisposed rectangular passageways l8 which are in constant communicationat their inner ends with a central opening [9 in the lower end of thetable supporting column [5. The radial passageways l8 terminate at theirouter ends in laterally extending branches that lead to upwardlyinclined and outwardly flared apertures 2| in the surface I4 on whichthe molds are supported and on which the bottoms of the body sectionsIla slide as they are moved from their opened to closed positions, andvice versa.

The apertures 2| are so located that when the body sections Ha of thepress molds are opened they are adapted to direct currents of coolingfluid against the inner sides of said sections (see Fig. 3) and when thepress molds are closed the apertures 2| register with openings 22 inlugs 23 that are attached to the lower ends of the body sections Ila(Fig. 4). The openings 22 in the lugs 23 are so shaped as to deflect thecurrents issuing from the apertures 2| upwardly and inwardly over theribs or fins l'l forming the corrugated outer surfaces of the closedmold section I la.

The outer ends of the passages l8 may also be provided, if desired, withflared apertures 25 which are positioned in axial alignment with thecenters of the mold sections Ila-4 lb and which serve when the bodysections Ila are opened to direct currents of fluid upwardly against thelower end of the suspended parison blanks and thereby aid in bothsupporting and cooling such parisons as they pass from the pressing zoneto the transfer station. The flared apertures 25 also serve, when themold sections are closed, to permit. the cooling fluid to impingeagainst the bottom surfaces of the body sections Na and to escapethrough shallow radially cut grooves 26 formed therein.

A suitable cooling fiuid, such as air, charged with a, mist ofvaporizable liquid is supplied to the central opening IS in the tablecolumn Hi from any suitable source and in any desired manner such, forexample, as by attaching the outlet port of a suitable blower, notshown, to the passage I9 by a suitable delivery pipe. With such anarrangement the air can be readily impregnated with a fog of finelydivided liquid particles from a spray of liquid injected into the inletport of the blower. When such a mixture of air and fog impinges on theheated mold surfaces, the latter are very effectively cooled both byforced convection currents and by the immediate vaporization of theliquid particles.

With the improved mold construction the accelerated cooling of the moldunits by increased conduction, radiation, convection and vaporizationaction increases very materialiy (in some cases by 100% or more) thepossible rate of output of the forming machine per mold, and thereby amuch larger production from a given number of forming units is obtainedor conversely the same output from a smaller number of these units isobtained. In either case the operating efficiency of the machine issubstantially increased and the size of the machine per unit of outputis materially reduced.

From the foregoing description of the invention, it is apparent that theinvention may be. applied to any type of forming machine in which moltenglass charges are subjected to a pressing action while the charge ofglass is retained in a mold and that the feature of forced convectioncurrents may be used independently, either with or without a mold havinga ribbed or high heat radiating outer surface.

For these reasons, it is not desired to limit this invention to anyparticular species of construction which has been described as exemplaryof the present improvements or to have these improvements defined in anyless comprehensive way than is warranted by the appended claims.

What is claimed as new and desired to be secured by Letters Patent is:

1. In a machine for fabricating glassware, a mold having separable bodysections, means for opening and closing said body sections, a memberover which said body sections slide during opening and closing, saidmember having spaced ports therein arranged to direct a current ofcooling medium against the inner surfaces of said sections when saidmold is opened, and means on said body sections adapted to cooperatewith said ports when said mold is closed for directing cooling mediumover the outer surfaces of said body sections.

2. In a machine for fabricating glassware, a mold having separable bodysections, means for opening and closing said body sections, a memberover which said body sections slide during opening and closing, saidmember having ports therein arranged so as to direct a current ofcooling medium against the inner surface of each body sectionwhen saidmold is open, and a lug on each body section and having an openingtherein for registering with one of said ports when said mold is closedwhereby cooling medium is directed against the outer surfaces of saidbody sections.

3. In a. machine for fabricating glassware, a mold having separable bodysections, means for opening and closing said sections, verticallyextending radiating fins on the outer surface of each such body section,and a mold supporting member over which said sections slide duringopening and closing, said member having spaced ports therein arranged todirect cooling medium upwardly in contact with said radiating fins whensaid mold is closed.

4. In a machine for fabricating glassware, a mold having separable bodysections, means for opening and closing said sections, verticallyextending radiating fins on the outer surface of each such body section,a mold supporting member over which said sections slide during theopening and closing, said mold supporting member having ports thereinarranged to direct a current of cooling medium against the innersurfaces of said body sections when said mold is opened, and a lug oneach body section and having an opening therein for registering with oneof said ports when said mold is closed whereby cooling medium isdirected upwardly in contact with said radiating fins.

MILDRED M. WADSWORTH. Administratrim of the Estate of Frank L. 0.

Wadsworth, Deceased.

